mirror of https://github.com/SixLabors/ImageSharp
Brian Popow
5 years ago
7 changed files with 225 additions and 119 deletions
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// Copyright (c) Six Labors.
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// Licensed under the Apache License, Version 2.0.
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namespace SixLabors.ImageSharp.Formats.Tiff |
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{ |
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/// <summary>
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/// The number of bits per component.
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/// </summary>
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public enum TiffBitsPerSample |
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{ |
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/// <summary>
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/// The Bits per samples is not known.
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/// </summary>
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Unknown, |
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/// <summary>
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/// One bit per sample for bicolor images.
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/// </summary>
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One, |
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/// <summary>
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/// Four bits per sample for grayscale images with 16 different levels of gray or paletted images with a palette of 16 colors.
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/// </summary>
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Four, |
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/// <summary>
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/// Eight bits per sample for grayscale images with 256 different levels of gray or paletted images with a palette of 256 colors.
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/// </summary>
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Eight, |
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/// <summary>
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/// Each channel has 8 Bits.
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/// </summary>
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Rgb888, |
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} |
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} |
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// Copyright (c) Six Labors.
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// Licensed under the Apache License, Version 2.0.
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using System; |
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using SixLabors.ImageSharp.Formats.Experimental.Tiff; |
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namespace SixLabors.ImageSharp.Formats.Tiff |
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{ |
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internal static class TiffBitsPerSampleExtensions |
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{ |
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private static readonly ushort[] One = { 1 }; |
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private static readonly ushort[] Four = { 4 }; |
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private static readonly ushort[] Eight = { 8 }; |
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private static readonly ushort[] Rgb888 = { 8, 8, 8 }; |
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/// <summary>
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/// Gets the bits per channel array for a given BitsPerSample value, e,g, for RGB888: [8, 8, 8]
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/// </summary>
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/// <param name="tiffBitsPerSample">The tiff bits per sample.</param>
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/// <returns>Bits per sample array.</returns>
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public static ushort[] Bits(this TiffBitsPerSample tiffBitsPerSample) |
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{ |
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switch (tiffBitsPerSample) |
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{ |
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case TiffBitsPerSample.One: |
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return One; |
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case TiffBitsPerSample.Four: |
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return Four; |
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case TiffBitsPerSample.Eight: |
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return Eight; |
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case TiffBitsPerSample.Rgb888: |
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return Rgb888; |
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default: |
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TiffThrowHelper.ThrowNotSupported("The bits per pixels are not supported"); |
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return Array.Empty<ushort>(); |
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} |
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} |
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/// <summary>
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/// Maps an array of bits per sample to a concrete enum value.
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/// </summary>
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/// <param name="bitsPerSample">The bits per sample array.</param>
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/// <returns>TiffBitsPerSample enum value.</returns>
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public static TiffBitsPerSample GetBitsPerSample(this ushort[] bitsPerSample) |
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{ |
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switch (bitsPerSample.Length) |
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{ |
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case 3: |
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if (bitsPerSample[0] == Rgb888[0] && bitsPerSample[1] == Rgb888[1] && bitsPerSample[2] == Rgb888[2]) |
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{ |
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return TiffBitsPerSample.Rgb888; |
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} |
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break; |
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case 1: |
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if (bitsPerSample[0] == One[0]) |
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{ |
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return TiffBitsPerSample.One; |
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} |
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if (bitsPerSample[0] == Four[0]) |
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{ |
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return TiffBitsPerSample.Four; |
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} |
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if (bitsPerSample[0] == Eight[0]) |
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{ |
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return TiffBitsPerSample.Eight; |
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} |
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break; |
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} |
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return TiffBitsPerSample.Unknown; |
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} |
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/// <summary>
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/// Gets the bits per pixel for the given bits per sample.
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/// </summary>
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/// <param name="tiffBitsPerSample">The tiff bits per sample.</param>
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/// <returns>Bits per pixel.</returns>
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public static int BitsPerPixel(this TiffBitsPerSample tiffBitsPerSample) |
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{ |
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var bitsPerSample = tiffBitsPerSample.Bits(); |
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int bitsPerPixel = 0; |
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foreach (var bits in bitsPerSample) |
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{ |
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bitsPerPixel += bits; |
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} |
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return bitsPerPixel; |
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} |
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} |
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} |
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